JPS62164899A - Composite bus bar for electric conduction - Google Patents

Abstract

PURPOSE:To enable plastic working into a complex shape by interposing an intermediate layer of an Ag-Cu-Sn alloy or an Al-Cu-Al alloy between a core material of Cu or a Cu alloy and a shell layer of Ti or a Ti alloy so as to increase the cladding strength of the shell layer to the core material. CONSTITUTION:A core material of Cu or a Cu alloy is clad with an Ag-Cu-Sn alloy or an Al-Cu-Al alloy in the form of an intermediate layer. The clad core material is further clad with Ti or a Ti alloy to obtain a composite bus bar for electric conduction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a current-carrying rod, a so-called bus bar, used for energizing electrodes for electrolysis, plating, etc. in the electrochemical industry.

(Prior art and its problems) -Cu or Cu alloy is used for the bus bar,
Since electrolytic baths and plating baths involve corrosive atmospheres such as chlorine gas and sulfur dioxide gas, busbars made of Cu or Cu alloys, which have poor corrosion resistance, have to be replaced frequently.

On the other hand, Ti or Ti alloy has excellent corrosion resistance and can withstand long-term use in the above corrosive atmosphere, but because of its low electrical conductivity, it is difficult to increase current density and perform efficient electrolysis or plating. There wasn't.

Recently, cladding technology has progressed, and Cu or Cu alloy has been replaced with Ti.
Alternatively, a conductive composite bus bar has been developed that is clad with a Ti alloy and has high conductivity and excellent corrosion resistance.

This conductive composite bus bar is manufactured by hot extrusion, rolling, drawing, explosive crimping, etc., but is the most easily mass-produced method, and it is also possible to coat the entire periphery with Ti or Ti alloy. The inter-extrusion method is industrially advantageous. Further, in order to use the core material Cu or Cu alloy in a state with good electrical conductivity, it is preferable to annealing at 600° C. or higher.

However, Ti or Ti alloys are highly reactive, and in particular Cu or Cu alloys are easily brittle Cu, Ti, CuT1, Cu Ti, etc. due to the heating temperature during hot extrusion, processing heat, etc.
Since a 3' intermetallic compound is formed, the cladding strength is weak, and there is a drawback that peeling occurs on the cladding surface during rolling, wire drawing, and bending after extrusion. In addition, it is possible to prevent the formation of intermetallic compounds by lowering productivity, reducing the area reduction rate, and keeping the extrusion temperature low, but intermetallic compounds may be generated during strain relief annealing after subsequent processing such as rolling. This has the disadvantage that the cladding strength deteriorates.

(Object of the invention) The present invention has been made to solve the above-mentioned drawbacks,
A conductive composite that does not cause peeling on the cladding surface even when the area reduction rate is increased to increase productivity, and the cladding strength does not deteriorate even after annealing to remove strain during processing, and can be processed into complex shapes. The purpose is to provide a bus bar.

(Means for Solving the Problems) In order to solve the above problems, the conductive composite busbar of the present invention has an intermediate layer of Ag-Cu-Sn alloy or Ag- It is clad with a Cu-Al alloy and further clad with Ti or a Ti alloy on the outside.

The conductive composite busbar of the present invention is manufactured using Ti or Ti
Alloy/Ag Cu-Sn or Ag-Cu-Al/
Since the fins and throats of Cu or Cu alloy are subjected to heat treatment such as hot extrusion, strain relief annealing after extrusion, and annealing to increase electrical conductivity, Sn in Ag-Cu-5n alloy or Ag-Cu- A2 in the Al alloy causes selective diffusion to the Ti side, and 5n-Ti or Al-Ti forms a solid solution and is ductile, so the cladding strength is increased. The remaining Ag or Ag-Cu alloy is the core material Cu or Cu.
Since the alloy is a malleable alloy, the cladding strength on the Ae or A/alloy side of the core material is also high.

Since Ag in the Ag-Cu-Sn alloy or Ag-Cu-Al alloy of the intermediate layer is soft, it can buffer thermal shock caused by a difference in thermal expansion during heat treatment.

The intermediate layer Ag-Cu-Sn alloy or Ag-Cu-Al alloy may be inserted in any form during manufacturing, but it is inserted in the form of a thin plate between the Ti or Ti vibe and the Cu or Cu alloy billet. After that, it is common to use a hot extrusion process to produce a conductive composite busbar made of wire or plate material.

(Example) Examples of the conductive composite bus bar of the present invention will be described together with conventional examples.

First, a conventional example will be described. A Cu billet with an outer diameter of 91 phases was inserted into a Ti vibrator with an outer diameter of 104 mm and an inner diameter of 92 mm, sealed, and then extruded at 700°C. The width of the extruded material is 6
It was 0 dragons and the thickness was 20 dragons. Thereafter, strain relief annealing was performed at 650 DEG C., and a bus bar was prepared by rolling to a width of 70 mm and a thickness of 10 mm, which was then subjected to a cold 90 degree bending test.

Next, to explain an example, a Cu billet with an outer diameter of 91 mm is inserted into a Ti pipe with an outer diameter of 104 mm and an inner diameter of 92 mm, and a thickness of Q,
A 1 mm thin plate of AB-Cu 10 wt%-Sn 2 wt% alloy was inserted, and after sealing these, extrusion processing was performed at 700°C. The extrusion had a width of 60 mm and a thickness of 20 mm.

Thereafter, strain relief annealing was performed at 650° C., and a bus bar was made by rolling to a width of 70@cm and a thickness of 1 Qis, and a cold 90 degree bending test was performed on this bus bar.

When the cross sections of the busbars after rolling and the busbars after the bending test of the above conventional example and example were observed with a metallurgical microscope,
The results shown in the table below were obtained.

As can be seen from the table above, conventional busbars cannot be used as busbars due to edge peeling due to weak cladding strength and cracking of the outer covering material after bending tests.
No 5A+1 separation or cracks were observed in the bus bar of the example, and it can be used satisfactorily as a bus bar.

(Effects of the Invention) As can be seen from the above explanation, the conductive composite busbar of the present invention has an Ag-Cu-sn alloy or an Ag- Cu-A
j! Since there is an intermediate layer of alloy, Cu or Cu
The cladding strength of the alloy core material and Ti or Ti alloy outer layer is extremely high, and it has the effect of being able to be plastically worked into complex shapes.It also has electrical conductivity and corrosion resistance, making it superior to conventional materials. It can be said to be an epoch-making product that can replace the conventional conductive composite busbar.

Claims (1)

[Claims] Ag- as an intermediate layer on the outside of the core material of Cu or Cu alloy.
A conductive composite busbar comprising a Cu-Sn alloy or an Al-Cu-Al alloy cladding, and a Ti or Ti alloy cladding on the outside.